Catheter with single axial sensors

Abstract

A catheter has single axis sensors mounted directly along a portion of the catheter whose position/location is of interest. The magnetic based, single axis sensors are on a linear or nonlinear single axis sensor (SAS) assembly. The catheter includes a catheter body and a distal 2D or 3D configuration provided by a support member on which at least one, if not at least three single axis sensors, are mounted serially along a length of the support member. The magnetic-based sensor assembly may include at least one coil member wrapped on the support member, wherein the coil member is connected via a joint region to a respective cable member adapted to transmit a signal providing location information from the coil member to a mapping and localization system. The joint region provides strain relief adaptations to the at least one coil member and the respective cable member from detaching.

What is claimed is: 
     
       1. A catheter comprising:
 an elongated body; 
 a distal member distal of the elongated body, the distal member having a support member and a configuration; 
 a control handle proximal of the elongated body; 
 a magnetic-based sensor assembly including at least one conducting member comprising a wire having first and second ends, the wire comprising:
 a coil region that is wrapped on the support member; and 
 a joint region associated with and adjacent the coil region, the joint region comprising:
 a first connection of the first end of the wire to a cable member at a first location proximal of the associated coil region, and 
 a second connection of the second end of the wire to the cable member at a second location proximal of the associated coil region, 
 a first strain relief construction comprising a first plurality of windings of the cable member around the support member, and 
 a second strain relief construction comprising a second plurality of windings of the cable member around the support member, the second plurality of windings of the cable member being spaced from the first plurality of windings of the cable member; 
 
 a third strain relief construction comprising a third plurality of windings of the cable member around the support member, the third plurality of windings of the cable member being spaced from the first and second pluralities of windings of the cable member; 
 the cable member being adapted to transmit a signal providing location information from the conducting member to a mapping and localization system, and the joint region provides strain relief to the associated coil region and the cable member from detaching. 
 
 
     
     
       2. The catheter of  claim 1 , wherein the first end of the wire forms a first amount of slack in the wire between the proximal end of the coil region and the first connection, and/or the second end of the wire forms a second amount of slack in the wire between the proximal end of the coil region and the second connection. 
     
     
       3. The catheter of  claim 1 , wherein the windings of the third plurality of windings of the cable member are looser than the windings of the first plurality of windings of the cable member and the windings of the second plurality of windings of the cable member. 
     
     
       4. The catheter of  claim 1 , wherein the third plurality of windings of the cable member comprises diagonal windings. 
     
     
       5. The catheter of  claim 1 , wherein the second end of the wire extends through the coil region from a distal end of the coil region to the second location proximal of the coil region. 
     
     
       6. The catheter of  claim 5 , wherein the second plurality of windings of the cable member amounts to at least 720 degrees of winding around the support member. 
     
     
       7. The catheter of  claim 1 , wherein the magnetic-based sensor assembly further comprises a nonconductive tubing mounted on the support member, the coil region of the wire of the at least one conducting member being wrapped on the nonconductive tubing. 
     
     
       8. The catheter of  claim 7 , wherein the joint region is proximal of the nonconductive tubing. 
     
     
       9. The catheter of  claim 1 , wherein the first plurality of windings of the cable member amounts to at least 720 degrees of winding around the support member. 
     
     
       10. The catheter of  claim 9 , wherein the second plurality of windings of the cable member amounts to at least 720 degrees of winding around the support member. 
     
     
       11. The catheter of  claim 1 , wherein the magnetic-based sensor assembly further comprises a protective tubing over the coil region, joint region and first strain relief construction. 
     
     
       12. The catheter of  claim 11 , wherein the magnetic-based sensor assembly further comprises an epoxy or UV glue occupying a space inside of the protective tubing. 
     
     
       13. The catheter of  claim 12 , wherein the epoxy or UV glue forms end caps at each end of the protective tubing. 
     
     
       14. The catheter of  claim 13 , wherein one of the end caps covers the second strain relief construction. 
     
     
       15. The catheter of  claim 1 , wherein the at least one conducting member of the magnetic-based sensor assembly includes at least three conducting members, each of the at least three conducting members comprising a respective wire having respective first and second ends, each respective wire comprising:
 a respective coil region wrapped on the support member at a respective location along the length of the support member, and 
 a respective joint region adjacent its associated respective coil region, the joint region comprising:
 a first respective connection of the first end of the respective wire to a respective cable member at a first respective location proximal of its associated respective coil region, and 
 a second respective connection of the second end of the respective wire to the respective cable member at a second respective location proximal of its associated respective coil region, 
 a first respective strain relief construction comprising a first respective plurality of windings of the respective cable member around the support member, 
 a second respective strain relief construction comprising a second respective plurality of windings of the respective cable member around the support member, the second respective plurality of windings of the respective cable member being spaced from the first respective plurality of windings of the respective cable member, and 
 a third respective strain relief construction comprising a third respective plurality of windings of the respective cable member around the support member, the third respective plurality of windings of the respective cable member being spaced from the first and second respective pluralities of windings of the respective cable member; 
 
 each respective cable member being adapted to transmit a respective signal providing location information from the respective conducting member to the mapping and localization system, and each respective joint region provides strain relief to the respective coil region and the respective cable member from detaching. 
 
     
     
       16. The catheter of  claim 15 , wherein the second respective end of the respective wire extends through the respective coil region from a distal end of the respective coil region to the second respective location proximal of the respective coil region. 
     
     
       17. The catheter of  claim 15 , wherein the first respective end of the respective wire forms a first respective amount of slack in the respective wire between the proximal end of the respective coil region and the first respective connection, and/or the second end of the respective wire forms a second respective amount of slack in the respective wire between the proximal end of the respective coil region and the second respective connection. 
     
     
       18. The catheter of  claim 15 , wherein the windings of the third respective plurality of windings of the respective cable member are looser than the windings of the first respective plurality of windings of the respective cable member and the windings of the second respective plurality of windings of the respective cable member.